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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Sun, 30 Apr 2017 14:35:04 +0200
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Subject: Re: do a client behind NAT needs to define listening port?
To: Rostislav Belotserkovski <rost.bel@gmail.com>
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If you're the client, you're already connecting _up_ to a server,
which means ordinary stateful NAT takes care of that.

Comparison: do you manually specify a source port when making an
outgoing HTTP connection?